NO YOU CAN'T the "Y" adapter sets the correct focal distance to receive maximum signal from the reflective surface of the dish. A DISH 500 with Legacy Duals will work for Directv but other DISH Network LNB combinations will not work due to switches and frequencies used by DISH. Their is also an "I" adapter from DISH to replace the "Y" bracket that will maintain the focal distance and gain a small amount of additional signal from the larger dish.